/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.linkedin.pinot.core.plan;
import com.linkedin.pinot.core.common.Operator;
/**
* The <code>PlanNode</code> is a single execution plan node inside the {@link Plan} tree.
*/
public interface PlanNode {
/**
* Get the execution operator associated with the plan node.
*
* @return execution operator.
*/
Operator run();
/**
* Log the tree structure under the plan node.
*
* @param prefix prefix for each line logged.
*/
void showTree(String prefix);
}